Boring-drill.



C. E. REED.

BORING DRILL.

APPLICATION FILED AUG- 13. 1917.

- Patented Apr. 23, 1918 @FWTMM.

CLARENCE Enw. REED, or HOUSTON, Texas.

' BORING-DRILL.

messes.

Specification of Letters Patent.

Patented Apr. 23, rare.

Application filed August 13, 1917. Serial No. 186,024.

To all whom it may concern:

Be it known that I, CLARENCE E. REED, of Houston, Texas, have invented certain new and useful Improvements in Boring-Drills, of which the following is a specification.

My invention relates to boring drills of the type having roller forms of cutters and particularly those employing roller cutters of frusto-conical shape.

The present invention is a specific form or embodiment of that made the subject of application for Letters Patent of the United States filed by me April 21st, 1917, Sr. No. 163,696, which has since become Patent 1,236,983 issued August ll, 1917.

One object of my present invention is to enable drill heads now in use in the field readily to be converted into a form which will perform the same functions and present the same advantages as set forth in. the above mentioned application.

' The invention consists in the features hereinafter described and particularly pointed out in the claims.

In the drawings Figure 1 is a side elevation of a head embodying the invention.

Fig. 2 is a bottom plan view, and

Fig. 8 is a side view of the attachment.

Fig. 4 is a sectional view on line 4-4 of Fig. 3.

Drill heads of one type now in use are provided with frusto-conical cutters such as shown at 1 arranged with their axes substantially at a right angle to each other, being mounted in a shaped pocket in the end face of the head, t e A shaped space being left open at the sides, and having no ade quate provision for confining the flow of water, used for clearing away accumulations, to the converging sides of the cutters; and for the purpose of carrying out, in connection with such heads, the principle and effects of the invention set forth in the above mentioned application, I employ an attachment for the head adapted to fit over the recess of the head in which the cutters are mounted. One of these attachments is shown in Fig. 3 consisting of a plate 2 of a size to extend over the A shaped recess, there being one of these plates for each side of the head. They re attached in place by any suitable mean such as belts or screws 3. Each plate has an inwardly extending portion 4, the inner face of which lies substantially parallel with and close to the adjacent side of the cutter with a narrow space 5 between it and the side of the cutter.

The inwardly extending portions 4 of the plates incline inwardly on their inner faces from their upper to their lower ends, and the lower portions of these protuberances are narrower than their upper portions measured across the plate in a direction from side edge to side edge thereof, or, in other words, these plates have portions 4:, the inner faces of which incline inwardly and downwardly to conform substantially to the inwardly convergent conical sides of the cutters and with a narrow space between these downwardly and inwardly inclining faces and the said conical portions of the cutters, these narrow passages confining the water to work upon cut material to clear the same from the cutters.

The conduits for the water are indicated at 7, 7. Each plate may have a triangular piece or projection at 6 at or near its upper part to fit in the apex of the A shaped recess of the head to give a good hearing at this point and to fill this cavity and thus confine the action of the water close to the surface of the cutters.

I do not limit myself to the precise form of plate shown or to any particular way of forming the tapered protuberance on the inner side thereof. The cutter head is referably made in section as shown at K, B, and the two attachments, one on each side of the head, will act as means. for securing the sections together, though means in addition to these attachment plates may be employed for holding the sections together.

The above described construction presents the advantage that it permits access to the upper portion of the cutters and to the space within the head. Access is necessary at times, particularly when the head becomes worn and it is necessary to place packing in the joints of the head sections so asto securely hold the sectional head'in the collar. In a one piece head of this design the cone cutters could not be put in place with-' out such removable plates, and if the head is made in sections this removable plate will not only permit the bearing support to be integral with part or one piece of the head, thereby strengthening the drill, but will hold the pieces together and make unnecessary the use of a separate or detachable support for the cone hearing. A separate or detachable support for a bearing in a drill of this design is objectionable because it is weak and parts are more liable to become lost in the well during drilling operations.

I claim 1. A boring drill having frusto-conical' ering said recesses at the sides of the head,

lsaid plate each having its inner face inclining inwardly and downwardly and conforming substantially to the inwardly convergent conical ides of the cutters, and with a narrow passage between these inwardly and downwardly inclining faces and the conical portions of the cutters, said head having a conduit for water leading to the recess, substantially as described.

2. In combination in a boring drill, a head in sections and having a recess between the sections, roller cutters in the recess, and separate plates at the sides of the head attached removably to and connecting the sections,

each of said plates having a protuberance on its inner face inclining downwardly and in Wardly and conforming substantially to the inwardly convergent conical sides of the cutters and providing a narrow passage for water between itself and the cutters, said head having a conduit to lead water to the recess within the head, substantially as described.

3. :In combination in a boring drill, a head having a recess, roller cutters in aid recess, and separate plates attached to the head and covering the recesses at the sides of the head, each of said plates having a portion at its upper part extending inwardly and fitting against the wall of the recess and having also a protuberance at its lower part inclining inwardly and downwardly and conforming to the convergent conical sides of the cutters, said head having a to the reCeSS in the head, substantially as described.

In testimony whereof, I affix my signature.

CLARENCE EDW. REED.

conduit leading 

